The present disclosure relates to methods and systems for treating a fluid produced from a biorefinery to remove contaminants, such as metals and sulfur therefrom. Biomass is pyrolysed and activated to form activated carbon used to remove such contaminants. The fluid produced from the biorefinery may be one or more of a biofuel, a biogas, and wastewater.

A method for treating acrolein reactor wastewater, comprising the steps of: S1. mixing acrolein reactor wastewater and a carbonate aqueous solution to obtain a mixed solution, wherein the acrolein reactor wastewater has a pH value of less than 2 and contains 500 ppm to 3,000 ppm of acrolein, 50 ppm to 800 ppm of allyl alcohol, 40,000 ppm to 100,000 ppm of acrylic acid, 10,000 ppm to 30,000 ppm of formaldehyde, 3,000 ppm to 10,000 ppm of acetic acid and 3,000 ppm to 8,000 ppm of maleic acid; and the mixed solution has a pH value of 4 to 6, a COD concentration ranging from 7,500 ppm to 30,000 ppm, and a formaldehyde concentration ranging from 800 ppm to 4,000 ppm; S2. conveying the mixed solution obtained in step S1 to an anaerobic reactor (4) for biochemical treatment; and S3. conveying the solution treated in step S2 to an aerobic biochemical tank (5) for treatment; and reflowing at least one part of the solution treated in step S2 and/or S3 to step S2. Also provided is a device for treating acrolein reactor wastewater.

The invention provides a treatment system and a treatment method for PMIDA high-salinity wastewater. The treatment system includes a booster pump, a water inlet-outlet heat exchanger, a water inlet heater and an oxidation reactor, and the water inlet-outlet heat exchanger is provided with a wastewater inlet, a wastewater outlet, an oxidized water inlet, and an oxidized water outlet. An oxidized water from the oxidation reactor enters the water inlet-outlet heat exchanger through the oxidized water inlet, the oxidized water outlet is connected to an intermediate tank, the wastewater inlet is connected to the booster pump, and the wastewater outlet is connected to a wastewater heater. A micro-interface unit is disposed at the lower part in the oxidation reactor, for dispersing crushed gas into bubbles. A gas inlet is formed at a side wall of the oxidation reactor and is connected to the micro-interface unit through a pipeline.

This invention relates to processes for the removal of phosphorous from aqueous waste streams comprising phosphorus-containing compounds produced in the manufacture of glyphosate, in order to meet and typically exceed environmental regulations. More particularly, various embodiments of the present invention relate to the removal of phosphorous-containing compounds utilizing biological treatment system(s), oxidizing agent(s), and/or precipitant(s). The processes of the invention are also applicable to the removal of phosphorous compounds from phosphorous-containing waste streams other than those waste streams resulting from the manufacture of glyphosate.

A urea production process which includes and a synthesis section, a recovery section and evaporation section and a finishing section wherein the evaporation section includes a first evaporator and downstream thereof a second evaporator for urea solution. The second evaporator operates a lower pressure than the first evaporator to provide a urea melt and second vapor, solidifying the urea melt in a finishing section to provide a solid urea produce and off gas, scrubbing the off gas followed by condensing to produce a first condensate and second condensate; supplying the first condensate to a wastewater treatment section and supply the second condensate to the scrubber wherein the second condensate is used as a scrub liquid in the scrubber.

An integrated device and method for treating toxic and refractory wastewater are provided. The integrated device includes an adjusting pool, a first-stage reactor, a second-stage reactor, a third-stage reactor, a coagulation sedimentation pool, and a biochemical reaction pool that are sequentially connected in series, and further includes an aeration blower. Each of the first-stage reactor and the third-stage reactor is an advanced oxidation reactor, and the second-stage reactor is a Fenton reactor. The coagulation sedimentation pool includes 2 to 4 stages, and each stage of the coagulation sedimentation pool includes a coagulation tank, a primary sedimentation tank, and a secondary sedimentation tank that are connected in series. The biochemical reaction pool includes an anoxic tank, an aerobic tank, a settling tank, and a clean water tank that are connected in series. The wastewater treatment method combines the integrated device for treating toxic and refractory wastewater with reasonable process parameters.

A method for removing a fluorine-containing compound from discharge water, which includes bringing discharge water containing two or more fluorine-containing compounds represented by the following general formula (1) or (2) into contact with an adsorbent so as to adsorb the two or more fluorine-containing compounds:

(H—(CF.sub.2).sub.m—COO).sub.pM.sup.1  General Formula (1):

wherein m is 3 to 19, M.sup.1 is H, a metal atom, NR.sup.b.sub.4, where R.sup.b is the same or different and is H or an organic group having 1 to 10 carbon atoms, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent; and p is 1 or 2;

(H—(CF.sub.2).sub.n—SO.sub.3).sub.qM.sup.2  General Formula (2):

wherein n is 4 to 20; M.sup.2 is H, a metal atom, NR.sup.b.sub.4, where R.sup.b is the same as above, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent; and q is 1 or 2.

The present application provides a method for recycling selenium sources in a selenium-enriched yeast fermentation process, and a treatment system for selenium-containing wastewater. The method includes: step S1, performing separation and concentration treatments on selenium-containing wastewater produced in a selenium-enriched yeast fermentation process, so as to obtain a selenium-containing concentrated solution; step S2, adjusting a selenium content of the selenium-containing concentrated solution to a predetermined selenium content, so as to obtain a selenium-containing nutrient solution; and step S3, adding the selenium-containing nutrient solution into a selenium-enriched yeast fermentation reaction, so as to realize the recycling of the selenium source.

There is provided a method for efficiently recovering amide-based compounds such as N-methyl-2-pyrrolidone from a waste liquid containing amide-based compounds such as N-methyl-2-pyrrolidone generated, for example, in a production process of polyarylene sulfide.

The invention provides a process for treating waste water from an industrial process for producing propylene oxide, which process comprises subjecting the waste water to a catalytic wet oxidation treatment in the presence of a catalyst comprising metal nanoparticles-doped porous carbon beads.